Sprocket-wheel.



c. M/SNIDER.

SPROCKET WHEEL.

APPLICATION FILED SEPT ZG. I913.

1,244,384. Patented Oct. 23,1917.

JIII.

. If 1B 7 V wflmwaa v I UNITED STATES PATENT OFFICE.

assumes an. snrnnn, or communes, 01110,

ASSIGNOR TO THE JEFFREY MANUFAC- TUBING COMPANY, OF COLUMBUS, OHIO, A CORPORATION OF OHIO.

SPBOGKET-WHEEIJ.

Application filed September 26, 1913. Serial No. 792,008.

To all whom it may concern:

Be it known that I, Crnmnns M. SNInER,

a citizen of. the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Sprocket- .Wheels, of. which the following is a specificatlon, reference being had therein to the accompanying drawing.

'This invention relates to.v sprocket wheels of the type disclosed in the patents of William W. WVillson, Nos. 649,563, 948,385 and 994,896. The object of the present invention is to provide for sprocket wheels of this general type an improved means for adjusting the tooth-carrying sections outward andinward with respect to the central or hub section. Of the accompanying drawings, which illustrate one embodiment of the inven- Figure 1 is a side elevation of a sprocket wheel with some of the parts broken away.

Fig. 2 is an enlarged fragmentary sectionalview taken along the line 2-2 of Fig. 1.

Fig. 3 is a detail fragmentary sectional view showing the means for adjusting one of the tooth-carrying sections. It is taken along the line 33 of Fig. 2

Fig. 4 is an enlarged fragmentary sectional View taken along the line 44 of videdflwith a peripheral groove adapted for the reception of a rope or cable 4:, and with guide teeth 5, 5 adapted to cooperate with the groove to hold the cable 1nv place.

The peripheral .curvature of each section 2 is formed with a radius considerably less than the radius of. the wheel as a whole. It isnecessary to. rovide short gaps between each section an the next and the. cable will Each of the. secof curvature, the cable would necessarily be sharply bent at the end of each section with resulting wear and deterioration. By form ing the sections with smaller radii, as shown, each straight section of the cable is tangent to each adjacent curved section, with the result that the cable is not subjected to'any sharp bending. V

At the end of each of the sections 2 there is provided a pivoted tooth 6 of the sort shown and described in the several patents above referred to. As the construction and operation of the sprocket wheels havin teeth of this sort are now well known'an understood, it will not be necessary to enter into a detailed description. It is suflicient to point out that the teeth are pivoted in order that they may be enabled at each revolution to travel for a short distance in a straight line under the. influence of one of the sprocket blocks 6 secured to the cable, instead of following its normal curved path. In this way the wear between the teeth and the sprocket blocks is greatly reduced.

Adjacent each part 2 of the tooth-carry ing sections the hub section 1 of the wheel is provided with a pair of oppositely disposed notches 7, 7 which are separated by a centrally disposed rib or web 8. Each part 2 is provided with two oppositely disposed lugs 9, 9 adapted to enter the notches 7, 7 and to embrace the web 8. The edges of the notches 7, 7 are parallel, as are also the edges ofthe lugs 9, 9. The edges of the lugs engage the edges of the notches and in this way the parts 2 are positively guided for movement inward or outward and are firmly held against movement peripherally of the wheel.

Each part 2 'is provided with a hole 10 which is enlarged at its outer end- In register with the hole 10 in the part 2* is a hole 11 in the central hub section. A bolt 12 ex tends through the holes 10 and 11 and has its head positioned in the enlarged part of the hole 10. The other end of the bolt is threaded and is engaged by a nut 13.- It will be seen that by means of this bolt and nut the may be m1 looked a ainst outward movement. As s own, in ig 1 and 3 each of the webs 8 is provided with a transverse art 2 may be drawn inward and tightened and 'assis'tin holding the parts 2,

-2 -fagainst relative-movement.

slot in which 'is locateda nut 14. Through this slot there extends a hole 15 which is parallel to the holes and 11.- 'A bolt 16.

vextends through the hole and through thenut 14.1 It engages at its outer end withthe vcon'espondingIpart 2*,xand it will beseen that .hy turning the bolt 16 an outward pressure can be exerted on the part 2.

' It w'illbe clear that by means of the two bolts '12 and 16"eachpart 2 can be moved t The radial adjustment'of the tooth-carry "ing'sections is essential in order to make the pitch ofthe wheelthe ame as the pitch of the sprocket blocks, on the cable. Dining 7 use thecable will stretch and the pitch of the blockswillb e changed. In order for the most efli'cient operationof the wheel it must be'adjusted from time to time to correspond with the change the rope; l 1- am aware 'that in the Willson Patent,

No.fl994,896, above referred to, it was prokpdsedto providean adjustment by means of aboltL e IIn the presentconstruction inclined guideways and 1 similarly inclined toothcarrynig sections secure a number of advantages; The lines upon which each tooth 'section,n1oves {outward are such. that its teeth can be carried, not alonevoutward but',

a to a marked extent, peripherally, so that the driving teeth canbe advanced toward the sprocket gaps a relativelylong distance to 'movement. Y

modify the pitch distance between one driving tooth andthe next, the long slot and pin connectionsvat 3 permitting peripheral Again, the tangentially inclined shanksof' the vtooth sections, and the'tangentially ar relieves the ,boltsi ot 'a large partof the t ture, in'presence f two witnesses.

ranged adjusting screws are in such position that the screws are practically relieved of all v stress either on their threads or on 'lines' transverse to their axes. The back pressure on a driven toothsection is transmitted to J the metal of the rim at the rear edge of its inclined guidewayi The inward; pressure," on the tooth section is taken on theopposite edge of the rim and shank; This, "as stated,

strains. 1 I

-What' I claimis:

hub section' -with1a'rim having guideways formed on lines tangentialto circles around? adjustment. v on a 4. A cable sprocket wheel having a hub 1. ;A cable sprocket wheel center the hub,-toothy"carrying elements shanks fitting in the; said "guldeways' I an held thereby against circum erential move; ment, means for: adjustin the tooth-carry ing elements'in'said guidewa s' whereby'f they are moved hoth'periphera y outward and inward relatively to the wheel axis, and means for locking the tooth -carry ing elements in position after adjustment. ,v

2. A cable sprocket wheel having a; hub

section formed with guideways in pairs, one

guideway of each pair being on linesfitan gential to circles around the axis and at one side of the axis, and the other guideway of each pair being on lines tangential at the other side of the axisto: circles around it," tooth-carrying sections each formed of two adjustably connected companion elements,- each element having a guide shank fitted in one of the said guideways and held thereby against circumferential movement, means for adjusting each part of each tooth element outward and inward and also periphorally, and means'for locking it in position after adjustment.

3. A cable sprocket wheel having a hub at points remote from the axis, each guide way of each pair being on lines inclined inward "and. toward the lines of the other guideway and inclined to the. radii of both 7 section provided with guideways in pairs and guideways," tooth-carrying sections each: j

formed of two voverlapping companion "elements adapted to be clamped together and to have the teeth of one move peripherally of the wheel relatively tothe teeth of the otherand each section having an adjustable guide part fitted in one of said guideways and held thereby against circumferential movement, and means for clamping said sections rigidly in operative position after.

section with peripheral, guideways formed on right Y-lines, tooth-carrying elements having shanks fitting in the said guideways and held thereby against circumferential move-f ment, and means for. adjustingeach toothcarrying element inward and outward and positively moving said element inward.

In test mony whereo fllaflix my signa- LESfM, SNIDER.

i I Dunner T. r m 

